Burglar-alarm.



M. L. HARVEY.

BURGLAR ALARM.

APPLICATION FILED JUNE 5. 1915.

Patented Aug. 1, 1916.

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M. L. HARVEY.

BURGLAR'ALARM- APPLICATION FILED JUNE 5.1915.

1 1 92,893 Patented Aug. 1, 1916.

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UNITED STATES PATENT OFFICE.

' MORRIS L. HARVEY, OF NEW STRAITSVILLE, OHIO.

BURGLAR-ALARM.

Application filed June 5, 1915.

I terial.

An object of the invention is the novel arrangement of the parts whereby the main portions may be bodily moved into an operative position.

The invention consists in the features of construction combination, and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings, in which:

Figure 1 is a side elevation showing the device in operative position. Fig. 2 is a front elevation thereof. Fig. 3 is a horizontal section therethrough and a portion of the window frame. Fig. 4 is a vertical section through the sleeve and its associate parts. Fig. 5 is a perspective View of the trigger and rod. Fig. 6 is a horizontal sectional view.

Referring to the drawings, it will be seen that I have provided a substantially L-shaped hinge member 1 embracing the vertical portion of the window strip 2 and secured thereto in any suitable manner, such as by the screws 3. The second hinge memher 4 is of greater length than the member 1, when in blank form so as to have its extremities bent at right angles as shown at 5 and 6 and provided with two pairs of alining openings 7 and 8, the former receiving a sleeve 9 while the latter slidably receives a trigger rod 10. The sleeve 9 has its extremity provided with screw threads and its intermediate portion provided with an aperture 11 for a purpose to be described. The threaded extremities of the sleeve extend beyond the inturned ends of the hinge member 4 so as to be engaged by the internally threaded end members 12 and 13, the latter having one end closed with the exception of a centrally located aperture 14. Cooperatingwith the end member 12 is a plug Specification of Letters Patent.

Patented Aug. 1, 1916.

Serial No. 32,351.

15 having a depression 16 adapted to receive a cap or other suitable form of detonator.

For firing the cap, I provide a plunger 17 slidably mounted within the sleeve and attached to one extremity of a rod 18 that has its remaining extremity which extends beyond the end member 13 formed into a hook 19 that cooperates with the book 20 of the trigger 21 pivotally connected to the rod 10 heretofore mentioned. Encircling the rod 18 is a spring 22, the extremities of which abut the plunger 17 and the end member 13 respectively while encircling the rod 10 and abutting at its ends the undersurface of the trigger 21 and adjacent surface of the member 4 respectively is a second spring 23 of a tension greater than the normal tension of the first mentioned spring.

For preventing relative movement of the hinge members when in operative position,

I provide a lug 24 carried by the member 4 and adapted to enter a notch in the 1nemher 1.

When the device is to be used, the main hinge member is swung to a position to dispose the rod 10 directly above the upper edge of the lower sash, so that upon movement of the latter, the rod 10 will be forced upwardly, carrying with it the plunger 17 and rod 18 through the action of the trigger 20. This action continues on until the increased resiliency of the spring 22 is greater than the resiliency of the spring 23. Immediately this takes place, the trigger 21 is tripped and the plunger is thrown into violent contact with the cap by tension of the spring 22. For preventing muffiing of the sound waves created by the explosion, I provide the heretofore mentioned opening 11.

Having described the invention, what is claimed is:

1. A burglar alarm comprising a pair of hinged members, means to prevent relative movement of the members at predetermined times, a sleeve detachably mounted in one of said members, end members threaded onto the ends of said sleeve for preventing movement thereof, a'eap receiving plug secured into one of said end members, a plunger slida'bly mounted in the sleeve, a spring for forcing the plunger in one direction and trigger mechanism for initially putting the spring under tension and for subsequently allowing the spring to exert its tension upon said plunger.

2. A burglar alarm comprising a pair of hinged members, means to prevent relative movement of the members at predetermined times, a sleeve detachably mounted in one of said members, end members threaded onto the ends of said sleeve for preventing movement thereof, a cap receiving plug secured into one of said end members, a plunger slidably mounted in the sleeve, a spring for forcing the plunger in one direction and trigger mechanism for initially putting the spring under tension and for subsequently allowing the spring to exert its tension upon said plunger, said mechanism including a rod slidably mounted in one of said members, a trigger cooperating with the plunger, and a spring acting in opposition to the plunger spring.

In testimony whereof I affix my signature in presence of two Witnesses.

MORRIS L. HARVEY. Vitnesses:

P. R. SIMMs, JOHN TAYLOR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

